Hydraulic sand conveyer



oct. 19,1928. v Lsosss F. L. WARD HYDRAULIC SAND CONVEYER Filed Oct. 29,1923 raanaa ea ie, taaa JE'BEDERIG Iz. WARD, OF ORGHAR'D I., MICG'AN.

HYD'ULIC SAMI) CONVEYJER.

Application filedl. U'cto'ner 29, 1923. Serial Na. 671,572.

The invention relates to apparatus for portion, by contact with theblade F, will hydraulically conveying sand and gravel, such materialbeing first drawn in through 'a suction conduit and then conveyedthrough a discharge conduit to the point of delivery.

In the present state of the art apparatus of this character may besuccessfully used for the conveying of the sand and ravel a certaindistance from the source o supply, but where this distance is increasedthere will be a tendency for the material to drop out of Suspension.This results in increased friction and the slowing of the current so asto impose practical limits to the length of condult that can besuccessfully used.

It is the object of the invention to obtain a construction by 'means ofwhich a' greatly increased len th of conduit ,can be used without the ojectionable results above re`- ferred to. To this end the inventionconsists in providing the conveyer conduit with means for preventing thefalling out of the material and more s ecifically with means forimparting a. rotatlonal movement to the outer portion of the flowingstreanz, as hereinafter set forth.

In the'drawin Figure 1 is a (igrammatic view of a system to which animprovements are applied;

Figure 2 is a ongitudinal section through one of the conduit Sections;and

Figura 3 is a cross section thereof.

A is the. suction conduit of the conveyer which is provided with theusual auxiliaries, such as the pressure jets B for loosening thematerial drawn into the conduit by suction. O is the centrifugal pumpwhich produces the suction, and D is the delivery conduit through whichthe material is conveyed to' 40 the point of discharge.

My improvement consists in applyingto the delivery conduit D at certainpoints in its length means for imparting a rotational movement to theouter portion of the fluid column therein` This, as specifically shown,consists in introducing 'into the conduit D Sections E, which areprovided with one or more blades F extending spirallyalon the innersurface of the tube. These b ades preferably extend inward only a shortdistance, so that the main lbody of the stream is not interfered with,but the peripheral be given a rotary motion which will lift any materialfalling out of Suspension and de- 'liver it again into the main current.

I have found by comparative tests of my lmproved appa-ratus with similarapparatus having plane conduits that the delivery distance may be verygreatly inoreased. Thus with the same sized conduits and the same power,the distance may be increased from one-to two hundred per cent, or withthe same dista-nce the power required may be correspondingly decreased.

The sections E may be arranged wherever there is a tendency for thematerial to fall out of Suspension. Thus for a certain dis` tance fromthe pump, such for instance as one thousand feet, it may be unnecessaryto provide such Sections and beyond this point they may be used eithercontinuously or intermittently.

My improved construction may be used With all of the auxiliary deviceswhich are common injthis art, but I have merely illustrated the broadfeatures of the system diagrammatically.

What I claim as my invention is:

1. In a hydraulic system for conveying material in Suspension, thecombination with the `conveyer conduit, of an inwardly projecting spiralvane extending around the inner surface of said conduit for less thanone convolution andl terminating substantially at the bottom of theconduit.

2. In a hy-draulic system for conveying material in Suspension, thecombination with the conveyer conduit, .of a conduit section includedtherein, having an inwardly projecting spiral vane extending for lessthan one convolution, said vane starting substantially at the top ofsaid conduit and terminating substantially at the'bottom thereof.

3. In a hydraulio system for conveying material intsuspensiomthecombination with the conveyer conduit, of a conduit section havin aninwardly projecting spiral Vane exten ing for substantially one-halfconvolution only starting at the top of said conduit and terminating atthe bottom thereof.

In testimony where/of I aflix my signature.

FREDERIG L. WARD.

